SACRAMENTO — Gov. Arnold Schwarzenegger is essentially staging the first constitutional convention in 126 years with a special election to revamp the jumbled California Constitution his way. He is sidestepping political risks and safeguards in the most powerful emergency outlet Founding Fathers left for sweeping reform, analysts said Tuesday. But the path he's chosen around a convention is still opening what analysts and others called a Pandora's boxGovernor sidestepping constitutional reform tool that could backfire on the Republican governor. His critics — ranging from majority Democrats to wide-ranging special interests to conservative GOP groups — are scrambling to put their...